Limestone, slate sandstone and other softer stone is probably
available at a near by garden/landscaping supplier. Many larger
pieces are used for decorative landscaping. Marble maybe found
through a sculpture supply house/ stone dealer. If you don’t have
these available in NZ, please let me know. There is one very well
priced dealer in the LA area with a large variety of sculpting stone
available. Other sources for marble include counter and
architectural fabricators. Check around for salvage businesses in
building materials. Power tools for stone sculpting include angle
grinders, die grinders, flexshafts, drills, sanders(belt and all
types of random orbit) and saws(handheld “Skill” etc., type and power
hacksaws). Variable speed angle grinders are the best for larger
work. After rough shaping with chisels, saws and rasps; silicon
carbide is the choice for finishing. “Zec” disk are spiral silicon
carbide. These are available in several grits from 16 to 120 plus.
They are superior in cutting and longevity for marble and softer
stones. Run in the 4000 to 6000 rpm range, faster rpm will result in
the disk glazing and the loss of cutting ability. A router speed
control maybe used with a standard angle grinder to create a variable
speed unit. It will out last all other abrasives in cutting capacity
and longevity. For final finishing PSA and velcro style disks are
available in grits to 500 at a reasonable price. Used with a
flexible pad sanding disk with your drill. Very fast and efficient.
I used these in 3" and 5" sizes. Polish marble with tin
oxide(available in bar form) compound on a muslin buff in your drill.
Sculptural carving is my relaxing method from jewelry work. Any
other questions? Please ask. Marcus Amshoff PS use eye, ear and dust
protection with all power tools. Eye and dust protection for all
chisel and sawing work.